Capacitively coupled plasma reactor having very agile wafer temperature control
a plasma reactor and capacitively coupled technology, applied in chemical/physical/physical-chemical processes, coatings, chemical/physical/physical-chemical processes, etc., can solve the problems of degrading the now highly uniform etch rate distribution of the reactor, defeating the purpose, and uncontrollable wafer temperature rise, etc., to achieve the effect of facilitate filling the channels
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[0047]While the variable orifice size of the expansion valve 210 is the primary control over cooling rate and wafer temperature, additional or alternative temperature control and, if desired, heating of the wafer, is provided by a compressor-to-evaporator bypass valve 212. Complete conversion of all liquid coolant to the gas phase in the accumulator 204 can be ensured using a compressor-to-accumulator bypass valve 214.
[0048]While selection is readily made of a suitable coolant, a flow rate by the compressor 206 and an orifice size of the expansion valve that satisfies the foregoing conditions, the following is provided as a working example in which two-phase cooling is achieved:
[0049]ESC Inlet temperature: −10 to +50 deg C.
[0050]ESC Inlet pressure: 160 to 200 PSIG
[0051]ESC Inlet liquid-vapor ratio: 40%-60% liquid
[0052]ESC Inlet-Outlet max temperature difference: 5 deg C.
[0053]ESC Inlet-Outlet max pressure difference: 10 PSI
[0054]ESC Outlet Liquid-vapor ratio: 10% liquid
[0055]Accumul...
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